Physics-
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Easy

Question

A closed organ pipe of radius r1 and an open organ pipe of radius r2 and having same length 'L' resonate when excited with a given tuning fork. Closed organ pipe resonates in its fundamental mode where as open organ pipe resonates in its first overtone, then:

  1. r subscript 2 end subscript minus r subscript 1 end subscript equals L    
  2. r subscript 2 end subscript equals r subscript 1 end subscript equals L divided by 2    
  3. r subscript 2 end subscript minus 2 r subscript 1 end subscript equals 2.5 L    
  4. 2 r subscript 2 end subscript minus r subscript 1 end subscript equals 2.5 L    

The correct answer is: r subscript 2 end subscript minus 2 r subscript 1 end subscript equals 2.5 L

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